Bach M K, Jones D G, Kay A B
Immunology. 1975 Apr;28(4):773-9.
Preparations of ECF-A derived from anaphylactic guinea-pig lung diffusates were subjected to a variety of enzymatic degradations. The enzymes employed had specificityonly for their appropiate subtstates. No effect was found following treatmentwith relatively high doses of trypsin, alpha-chymotrypsin, pronase, alkaline phosphataseand sialidase. In contrast a loss of activity was demonstated in a dose-dependent fashion following incubation with tyrosinase, aryl sulphatase and leucine aminopeptidase, suggesting that ECF-A contains a phenolic hydroxyl group, a sulphate ester anda peptide linkage with a free alpha-amino group.
对从过敏性豚鼠肺扩散物中提取的嗜酸性粒细胞趋化因子A(ECF-A)制剂进行了多种酶降解处理。所使用的酶仅对其相应的底物具有特异性。用相对高剂量的胰蛋白酶、α-糜蛋白酶、链霉蛋白酶、碱性磷酸酶和唾液酸酶处理后未发现有影响。相反,与酪氨酸酶、芳基硫酸酯酶和亮氨酸氨肽酶孵育后,活性呈剂量依赖性丧失,这表明ECF-A含有一个酚羟基、一个硫酸酯和一个带有游离α-氨基的肽键。